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The Environmental Consequence of Burial Depth of Toxic Spoils and of Excessive Compaction of Prime Land on the Growth of Plants.
For Reference Only At Bureau Libraries :200 pages
The objectives of this report were to (1) determine the minimum depth of soil, nontoxic spoils, or treated spoils required to control the environmental effects that toxic spoils may have on the growth of agronomic plants and (2) determine the consequence of excessive compaction (bulk density) on restored prime land on the yield of those plants. Timothy, alfalfa, corn, soybeans, and wheat were used in determining the effect of soil burial depth and liming; alfalfa, corn, soybeans, and wheat were the crops used in testing the effect of compaction on growth. From a chemical point of view, acidic spoils do not need to be buried by 120 cm or 4 ft of soil, provided that adequate lime is applied to these spoils as a barrier prior to placement of good-quality topsoil and that only forage crops are to be grown. The burial depth must be increased to as much as 75 cm when grain crops such as corn and soybeans are to be grown. A conventional farm tractor-mounted subsoiler increased yields of soybeans and corn the first 1 or 2 yr, but the effect was diminished with time. Subsoiling did not produce significant increases for alfalfa or wheat. However, ripping with a bulldozer produced significant yield responses, especially for corn and soybeans, that have lasted for at least 3 yr. The ripping effectively reduced the bulk density at least within the zones through which the ripper had passed. Liming the upper 20 cm of subsoil significantly increased yields of alfalfa, corn, and soybeans. There also appeared to be an interaction between this lime treatment and soil depth.
CP; Final Contract Report;
For Reference Only At Bureau Libraries
University of KY